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Rules for Naming Binary Ionic Compounds Containing a Metal Ion With a Variable Charge. A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal. For example, iron(III) iodide, FeI3, is composed of iron ions, Fe3+ (elemental iron is a metal), and iodide ions, I- (elemental iodine is a nonmetal). Rule 1.
Naming binary (two-element) covalent compounds is similar to naming simple ionic compounds. The first element in the formula is simply listed using the name of the element. The second element is named by taking the stem of the element name and adding the suffix-ide.A system of numerical prefixes is used to specify the number of atoms in a molecule. Table 4.1 Numerical Prefixes for Naming Binary Covalent Compounds lists these numerical prefixes.Normally, no prefix is added to the first elementâs name if there is only one atom of the first element in a molecule. system of numerical prefixes is used to specify the number of atoms in a molecule. Table 4.1 Numerical Prefixes for Naming Binary Covalent Compounds lists these numerical prefixes. Normally, no prefix is added to the first elementâs name if there is only one atom of the first element in a molecule.